SG3845 Microsemi Corporation, SG3845 Datasheet

SG3845

Manufacturer Part Number

SG3845

Description

Manufacturer

Microsemi Corporation

Datasheet

1.SG1844JDESC.pdf (12 pages)

Specifications of SG3845

Case

SOP

Date_code

2000

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Current page: 1 of 12
Download datasheet (354Kb)

Rev. 1.6c,2006-02-02

-25 to 85

STD/883

The SG1844/45 family of control ICs

provides all the necessary features to

implement off-line fixed frequency, current-

mode switching power supplies with a

minimum number of external components.

Current-mode

improved line regulation, improved load

regulation, pulse-by pulse current limiting

and inherent protection of the power supply

output switch.

trimmed to ±1% over temperature. Oscillator

discharge current is trimmed to less than

±10%. The SG1844/45 has undervoltage

lockout, current-limiting circuitry

H E

0 to 70

DESC

-55 to

MIL-

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LXSG3844N-TR)

125

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

(°C)

N F I N I T E

SG3844M

SG3845M

SG2844M

SG2845M

Plastic DIP

8-Pin

RoHS Compliant / Pb-free

INPUT

Transition DC: 0503

architecture

The bandgap reference is

O W E R

SG28424N

SG3844N

SG3845N

SG2845N

Plastic DIP

14-Pin

11861 W

P R O D U C T H I G H L I G H T

demonstrates

O F

ESTERN

D E S C R I P T I O N

SG3844DM

SG3845DM

SG2844DM

SG2845DM

I N

Plastic SOIC

8-Pin

N N O V A T I O N

VENUE

RoHS Compliant / Pb-free

I N I T Y

Transition DC:0440

, G

and start-up current of less than 1mA. The

totem-pole output is optimized to drive the

gate of a power MOSFET. The output is low

in the off state to provide direct interface to

an N-channel device. Both operate up to a

maximum duty cycle range of zero to <50%

due to an internal toggle flip-flop which

blanks the output off every other clock

cycle. The SG1844/45 is specified for

operation over the full military ambient

temperature range of -55°C to 125°C. The

SG2844/45 is specified for the industrial

range of -25°C to 85°C, and the SG3844/45

is designed for the commercial range of 0°C

to 70°C.

PACKAGE ORDER INFO

ARDEN

SG3844

SG3844D

SG3845D

SG2842D

SG2845D

Plastic SOIC

14-Pin

I C R O E L E C T R O N I C S

ROVE

, CA. 92841, 714-898-8121, F

SG1844Y/DESC

SG1842Y/883B

SG1845Y/883B

Ceramic Dip

8-Pin

SG3844Y

SG3845Y

SG2844Y

SG2845Y

SG1844Y

SG1845Y

U R R E N T

R O D U C T I O N

SG1844J/DESC

N C

SG1844J/883B

SG1845J/883

O D E

Ceramic DIP

14-Pin

: 714-893-2570

SG3844J

SG3845J

SG2844J

SG2845J

SG1844J

SG1845J

SG1844/SG1845 Series

P W M C

A T A

SG1844F/DESC SG1844L/DESC

OPTIMIZED FOR OFF-LINE

CONTROL

LOW START-UP CURRENT

(<1mA)

AUTOMATIC FEED FORWARD

COMPENSATION

TRIMMED OSCILLATOR

DISCHARGE CURRENT

PULSE-BY-PULSE CURRENT

LIMITING

ENHANCED LOAD RESPONSE

CHARACTERISTICS

UNDER-VOLTAGE LOCKOUT

WITH 6V HYSTERESIS

(SG1844 only)

DOUBLE PULSE

SUPPRESSION

HIGH-CURRENT TOTEM-POLE

OUTPUT

INTERNALLY TRIMMED

BANDGAP REFERENCE

500kHz OPERATION

UNDERVOLTAGE LOCKOUT

SG1844 - 16 volts SG1845 - 8.4

volts

LOW SHOOT-THROUGH

CURRENT <75mA OVER

TEMPERATURE

AVAILABLE TO MIL-STD-883B

LINFINITY LEVEL "S"

PROCESSING AVAILABLE

H I G H R E L I A B I L I T Y

Cer Flatpack

10-Pin

O N T R O L L E R

K E Y F E A T U R E S

F E A T U R E S

H E E T

SG1844L/883B

SG1845L/883B

SG1844L

SG1845L

Ceramic LCC

20-Pin

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